Chicken Spinach and Mushroom Low-Carb Oven Dish

This Chicken Spinach and Mushroom Low-Carb Oven Dish is creamy, cheesy, comforting, and packed with delicious flavor! Tender bites of chicken are combined with earthy mushrooms, fresh spinach, garlic, and a rich creamy cheese sauce, then baked until bubbly and beautifully golden.

It’s an easy one-pan dinner that’s naturally low in carbohydrates, high in protein, and perfect for busy weeknights or meal prep!

Prep Time: 15 minutes
Cook Time: 30–35 minutes
Total Time: 50 minutes
Servings: 6
Difficulty: Easy
Ingredients
For the chicken casserole
– 2 lbs (900 g) boneless, skinless chicken breasts, cut into bite-sized pieces
– 8 oz (225 g) fresh mushrooms, sliced
– 3 cups fresh spinach
– 1½ cups shredded mozzarella cheese
– ½ cup grated Parmesan cheese
– 4 oz (115 g) cream cheese, softened
– ½ cup heavy whipping cream
– 2 tablespoons olive oil
– 3 cloves garlic, minced
– ½ teaspoon Italian seasoning
– ½ teaspoon paprika
– ½ teaspoon onion powder
– ½ teaspoon salt, or to taste
– ¼ teaspoon black pepper
Optional garnish
– Fresh parsley, chopped
– Extra Parmesan cheese
– Red pepper flakes
Instructions
Step 1: Prepare the oven
1. Preheat your oven to 375°F (190°C).
2. Lightly grease a 9 × 13-inch baking dish with olive oil or cooking spray.
3. Set aside.
Step 2: Season the chicken
1. Cut chicken breasts into evenly sized bite-sized pieces.
2. Place in a large bowl.
3. Add paprika, Italian seasoning, onion powder, salt, and black pepper.
4. Toss until the chicken is evenly coated.
Step 3: Cook the chicken
1. Heat olive oil in a large skillet over medium-high heat.
2. Add the seasoned chicken pieces.
3. Cook for approximately 4–5 minutes, stirring occasionally, until lightly golden on the outside.
4. Transfer to a plate.
The chicken will finish cooking in the oven.
Step 4: Cook the mushrooms and spinach
1. In the same skillet, add sliced mushrooms.
2. Cook for 4–5 minutes until softened and their excess moisture evaporates.
3. Add minced garlic and cook for 30 seconds.
4. Add fresh spinach and stir until wilted.
5. Remove from heat.
Step 5: Prepare the creamy cheese sauce
1. In a bowl, combine softened cream cheese and heavy cream.
2. Whisk until smooth.
3. Add half of the Parmesan cheese.
4. Stir until creamy and well combined.
5. Season with a little additional black pepper and Italian seasoning if desired.
Step 6: Assemble the casserole
1. Spread the chicken pieces evenly in the prepared baking dish.
2. Add the cooked mushrooms and spinach.
3. Pour the creamy cheese mixture over everything.
4. Gently stir to distribute the sauce.
5. Sprinkle mozzarella cheese evenly over the top.
6. Finish with the remaining Parmesan cheese.
Step 7: Bake
1. Place the dish in the preheated oven.
2. Bake uncovered for approximately 20–25 minutes, until the chicken reaches an internal temperature of 165°F (74°C).
3. If you want a deeper golden cheese topping, broil for another 1–2 minutes, watching carefully.
4. Remove from the oven and allow to rest for 5 minutes.
Step 8: Garnish and serve
Sprinkle with fresh parsley and extra Parmesan cheese.

Serve warm while the cheese is melted and bubbly!
Nutritional Information
Low-carb friendly
Estimated per serving, based on 6 servings.
Nutrient Amount
Calories 390 kcal
Protein 43 g
Total Fat 22 g
Saturated Fat 11 g
Carbohydrates 7 g
Fiber 1 g
Net Carbs 6 g
Sugar 2 g
Sodium 480 mg

Nutrition values are estimates and depend on the ingredients and brands used.
Nut Information & Allergy Guide
– Peanuts: No peanuts included.
– Almonds: No almonds included.
– Walnuts: No walnuts included.
– Cashews: No cashews included.
– Other tree nuts: None required.
– Dairy: Contains mozzarella, Parmesan, cream cheese, and heavy cream.
– Gluten: Naturally gluten-free when all packaged ingredients are verified.
– Eggs: No eggs included.
– Soy: No soy ingredients intentionally included; check product labels.
Nut-free note: This recipe is naturally nut-free as written. Always check packaged cheese and seasoning labels for cross-contact warnings.
Helpful Tips for the Best Results
1. Use fresh spinach: It gives the casserole a wonderful flavor and texture.
2. Cook mushrooms first: Removing excess moisture prevents a watery casserole.
3. Don’t overcook the chicken: Finish cooking it in the oven until it reaches 165°F.
4. Use freshly grated cheese: It melts beautifully and creates a creamy topping.
5. Soften cream cheese: This helps prevent lumps in the sauce.
6. Broil briefly: A minute or two under the broiler creates a gorgeous golden cheese crust.
Storage & Reheating
– Refrigerator: Store in an airtight container for 3–4 days.
– Freezer: Freeze in individual portions for up to 2 months for best quality.
– Thawing: Thaw overnight in the refrigerator.
– Oven: Reheat covered at 325°F (165°C) until heated through.
– Microwave: Heat individual portions in 30-second intervals until hot.
Frequently Asked Questions (Q&A)
Q1: Is this chicken spinach mushroom casserole keto-friendly?

Yes! The recipe is low in carbohydrates and contains protein, healthy fats, and non-starchy vegetables. Check the nutrition of your ingredients to confirm your personal carb target.

Q2: Can I use chicken thighs instead of chicken breasts?

Absolutely! Boneless, skinless chicken thighs work beautifully and provide a juicier, richer flavor.

Q3: Can I use frozen spinach?

Yes. Thaw it completely and squeeze out as much water as possible before adding it to the casserole.

Q4: Can I use canned mushrooms?

Yes, but fresh mushrooms provide better flavor and texture. Drain canned mushrooms thoroughly before using.

Q5: Can I make this casserole ahead of time?

Yes! Prepare the chicken and vegetables, assemble the casserole, cover, and refrigerate. Bake when ready, making sure the center reaches 165°F.

Q6: How do I prevent the casserole from becoming watery?

Cook mushrooms until their moisture evaporates, squeeze excess liquid from frozen spinach, and avoid adding too much cream.

Q7: Can I make this without heavy cream?

Yes. You can substitute half-and-half or unsweetened evaporated milk, although the sauce will be less rich.

Q8: What other cheeses can I use?

Cheddar, Monterey Jack, provolone, or Gruyère are excellent alternatives to mozzarella.

Q9: Can I add bacon?

Definitely! Cooked and crumbled bacon adds a delicious smoky flavor.

Q10: What can I serve with this low-carb dish?

Try cauliflower rice, roasted broccoli, zucchini noodles, or a fresh green salad.

Q11: How do I know when the chicken is fully cooked?

Use a food thermometer to check the thickest chicken pieces. They should reach 165°F (74°C).

Q12: Can I make this dairy-free?

Yes, but you’ll need dairy-free cream cheese, cooking cream, and melting cheese alternatives. The flavor and nutrition will vary.
Serving Suggestions
– Garlic butter roasted broccoli.
– Creamy cauliflower mash.
– Fresh cucumber and tomato salad.
– Zucchini noodles.
– Cauliflower rice.
– Roasted asparagus.

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Final Note: This Chicken Spinach and Mushroom Low-Carb Oven Dish is everything you want in a comforting dinner: tender chicken, flavorful mushrooms, nutritious spinach, and plenty of melted cheese. It’s easy to prepare, satisfying, meal-prep friendly, and perfect for anyone looking for a delicious low-carb family meal! 🍗🧀🥬